and set \(\mathcal {A}_- := (\mathcal {J}(\mathcal {A}),\Psi ^*_\mathcal {A})\) .By Thm. 23 in [1]}, these are the only time orientations on \(\mathcal {J}(\mathcal {A})\) , deriving from \(\mathcal {A}\)  and \(\mathcal {A}^\mathrm {op}\) , respectively.
